LA purchased a few BYD e-Buses a few years ago and BYD is still trying to make a bus with a lifespan longer than about 1 month. While L.A. is trying to make the purchase work, most of their other U.S. transportation agency clients have simply demanded refunds.
BYD succeeds in places where quality and safety doesn't matter. It's why they've taken off in Asia but have made minimal inroads in countries with strong automobile safety regulations.